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You searched for: subject:"jet-aircraft"
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[texts]A review of naca research through 1954 on boron compounds as fuels for jet aircraft /project zip/ - Breitwieser, R.
No Abstract Available
Keywords: BORON COMPOUNDS; FUELS; JET AIRCRAFT
Downloads: 103
[movies]Into the Blue
How Britain developed her civil airlines since the war. commercial jet-aircraft. De Havilland Comet. Bristol Brabazon. air travel
Keywords: civil airline; Britain; jet-aircraft
Downloads: 19,950 4.00 out of 5 stars4.00 out of 5 stars4.00 out of 5 stars4.00 out of 5 stars(2 reviews)
[image]Broken F8U-3 model - NASA/Langley Research Center
Photographed on: 09/30/59. -- Pieces of small scale model broken in 16 Foot Transonic Tunnel.
Keywords: F-8 AIRCRAFT -- JET AIRCRAFT -- SUPERSON
Downloads: 18
[image]T-38 personnel - NASA/Langley Research Center
Photographed on 06/18/96.
Keywords: T-38 AIRCRAFT -- JET AIRCRAFT -- PERSONN
Downloads: 5
[image]F8U-3 wing model Vought - NASA/Langley Research Center
Photographed on: 11/05/59. -- Wings for large scale model aircraft.
Keywords: F-8 AIRCRAFT -- JET AIRCRAFT -- SUPERSON
Downloads: 17
[image]Views of F8U airplane - NASA/Langley Research Center
Image L57-2099 is available as an electronic file from the photo lab. See URL. -- Photographed on: 05/31/57. -- Views of F-8U Crusader aircraft at Langley.
Keywords: F-8 AIRCRAFT -- JET AIRCRAFT -- SUPERSON
Downloads: 22
[image]F8U-3 cockpit details - NASA/Langley Research Center
Photographed on: 07/27/59. -- Instrument panels in cockpit.
Keywords: F-8 AIRCRAFT -- JET AIRCRAFT -- SUPERSON
Downloads: 44
[image]F8U-3 stick modifications - NASA/Langley Research Center
Photographed on: 07/13/59. -- Stick controls in studio.
Keywords: F-8 AIRCRAFT -- JET AIRCRAFT -- SUPERSON
Downloads: 8
[image]F8U-3 aircraft - NASA/Langley Research Center
Image L59-6101 is available as an electronic file from the photo lab. See URL. -- Photographed on: 09/10/59. -- Crusader on runway. Navy aircraft number 6340. L59-6101 caption: "The navy's Vought XF8U-3 Supersonic Fighter was an entirely new design as compared to the earlier F8U Crusader series. This jet plane lost in competition with the McDonnell F4H, however, and was never put into production. Langley used the XF8U-3 in some of the first flight measurements of sonic boom intensity." Photograp...
Keywords: F-8 AIRCRAFT -- JET AIRCRAFT -- SUPERSON
Downloads: 119
[texts]PERFORMANCE CHARACTERISTICS OF SEVERAL DIVERGENT-SHROUD AIRCRAFT EJECTORS - Beale, W. T.
Performance characteristics of several divergent- shroud aircraft ejectors
Keywords: AFTERBURNING; DIVERGENCE; EJECTORS; JET AIRCRAFT; SHROUDS; EJECTOR; JET AIRCRAFT; SHROUDED BODY
Downloads: 96
[texts]Gilmore Creek Geophysical Observatory - Caskey, Stev
The following report provides a general technical description and operational overview of the Gilmore Creek Geophysical Observatory located near Fairbanks, Alaska.
Keywords: AEROACOUSTICS; JET AIRCRAFT NOISE; NOISE (SOUND); PROCEDURES; CONTAMINATION; INDUSTRIES
Downloads: 83
[texts]Performance of multiple jet-exit installations - Nelson, W. J.
Internal aerodynamics and performance of clustered jet-exit installations at transonic speeds
Keywords: AERODYNAMICS; JET EXHAUST; AIRCRAFT PERFORMANCE; BOATTAILS; JET AIRCRAFT; JET EXHAUST; TRANSONIC SPEED; AERODYNAMICS; AIRCRAFT PERFORMANCE; JET AIRCRAFT
Downloads: 64
[texts]CALCULATED PERFORMANCE OF A MERCURY-COMPRESSOR-JET POWERED AIRPLANE USING A NUCLEAR REACTOR AS AN ENERGY SOURCE - Doyle, R. B
Calculated performance of a mercury-compressor- jet powered aircraft using nuclear reactor as energy source
Keywords: COMPRESSORS; NUCLEAR AIRCRAFT; COMPUTATION; JET AIRCRAFT; MERCURY (METAL); NUCLEAR PROPELLED AIRCRAFT; NUCLEAR REACTORS; COMPRESSOR; JET AIRCRAFT; MERCURY /METAL/
Downloads: 143
[texts]The Far-Infrared Emission Line and Continuum Spectrum of the Seyfert Galaxy NGC 1068 - Spinoglio, Luigi
We report on the analysis of the first complete far-infrared spectrum (43-197 microns) of the Seyfert 2 galaxy NGC 1068 as observed with the Long Wavelength Spectrometer (LWS) onboard the Infrared Space Observatory (ISO). In addition to the 7 expected ionic fine structure emission lines, the OH rotational lines at 79, 119 and 163 microns were all detected in emission, which is unique among galaxies with full LWS spectra, where the 119 micron line, where detected, is always in absorption...
Keywords: JET AIRCRAFT NOISE; BYPASSES; NOISE REDUCTION; LINEAR ARRAYS; ENGINE TESTS; PHASED ARRAYS
Downloads: 107
[texts]Techniques used in Boeing subjective noise-rating studies - Little, J. W.
Field test techniques for determining jet aircraft noise effects on humans
Keywords: ACOUSTIC DUCTS; AERODYNAMIC CONFIGURATIONS; DC 8 AIRCRAFT; NACELLES; CONFERENCES; JET AIRCRAFT NOISE; NOISE REDUCTION; SOUND TRANSMISSION
Downloads: 75
[texts]Demonstrating a Realistic IP Mission Prototype - Rash, James
Flight software and hardware and realistic space communications environments were elements of recent demonstrations of the Internet Protocol (IP) mission concept in the lab. The Operating Missions as Nodes on the Internet (OMNI) Project and the Flight Software Branch at NASA/GSFC collaborated to build the prototype of a representative space mission that employed unmodified off-the-shelf Internet protocols and technologies for end-to-end communications between the spacecraft/instruments and the g...
Keywords: JET AIRCRAFT NOISE; EXHAUST NOZZLES; PREDICTION ANALYSIS TECHNIQUES; NOISE PREDICTION; TURBULENCE; PLUG NOZZLES; MATHEMATICAL MODELS
Downloads: 80
[texts]Monte Carlo analysis of inaccuracies in estimated aircraft parameters caused by unmodeled flight instrumentation errors - Hodge, W. F.
An output error estimation algorithm was used to evaluate the effects of both static and dynamic instrumentation errors on the estimation of aircraft stability and control parameters. A Monte Carlo error analysis, using simulated cruise flight data, was performed for a high-performance military aircraft, a large commercial transport, and a small general aviation aircraft. The results indicate that unmodeled instrumentation errors can cause inaccuracies in the estimated parameters which are compa...
Keywords: ACCEPTABILITY; JET AIRCRAFT NOISE; NOISE POLLUTION; HUMAN FACTORS ENGINEERING; NOISE TOLERANCE
Downloads: 88
[texts]ERTS-A data as a teaching and research tool in the Department of Geology - NON
The author has identified the following significant results. ERTS-1 prints have been used extensively in a geology of Alaska class to give a basic framework of the geology of the state. In addition, they have been intermittantly used in such diverse classes as: (1) Economic Geology (e.g. the Sn-bearing granites of the Seward Peninsula are particularly noticeable due to their wide contact metamorphic aureoles.) (2) A canned geology of Alaska lecture which has been given to two different introduct...
Keywords: ACOUSTIC MEASUREMENT; INFRARED RADIATION; JET AIRCRAFT NOISE; ACOUSTIC PROPERTIES; COMPUTER PROGRAMS; NOISE REDUCTION; NUMERICAL ANALYSIS
Downloads: 69
[texts]OPTIMUM AIRPLANE FLIGHT PATHS - CICALA, PLACID
THE GENERALIZED EQUATIONS ARE DISCUSSED WHICH PERTAIN TO AN AIRPLANE EXECUTING ITS FLIGHT PATH IN A SINGLE VERTICAL PLANE, UNDER A SEQUENCE OF STIPULATIONS SPECIFYING THE NATURE OF THE LOCAL OPTIMA WHICH ARE DISTINCTLY DIFFERENT IN CHARACTER ALONG SUCCESSIVE PORTIONS OF THIS PATH. THE AERODYNAMIC AND PROPULSIVE CHARACTERISTICS OF THE AIRPLANE ARE ALLOWED TO BE SPECIFIED WITH COMPLETE GENERALITY.
Keywords: EXPERIMENTATION; OSCILLATIONS; INDICATING INSTRUMENTS; ACCELERATION; TAKEOFF; DIALS; JET AIRCRAFT; STEADY STATE; ROLL; READING; POSITION (LOCATION)
Downloads: 91
[texts]DIFFUSION COEFFICIENT OF A PLASMA IN CROSSED ELECTRIC AND MAGNETIC FIELDS - POPOV, I. L
THE DIFFUSION COEFFICIENT OF A FULLY IONIZED PLASMA IS EXPRESSED. IT IS SHOWN THAT, UNDER CERTAIN CONDITIONS, THE LIFETIME OF A PLASMA IN A MAGNETIC TRAP CAN BE LONGER, ABOUT 1 MILLION SEC. AN EXPRESSION FOR ION MOBILITY IS ALSO DERIVED.
Keywords: ACOUSTIC MEASUREMENT; AIRPORTS; JET AIRCRAFT NOISE; NOISE PROPAGATION; ACOUSTIC PROPERTIES; HUMAN TOLERANCES; NOISE REDUCTION
Downloads: 100
[texts]Open Architecture SDR for Space - Smith, Carl
This paper describes an open-architecture SDR (software defined radio) infrastructure that is suitable for space-based operations (Space-SDR). SDR technologies will endow space and planetary exploration systems with dramatically increased capability, reduced power consumption, and significantly less mass than conventional systems, at costs reduced by vigorous competition, hardware commonality, dense integration, reduced obsolescence, interoperability, and software re-use...
Keywords: JET AIRCRAFT NOISE; NOISE PREDICTION (AIRCRAFT); SUPERSONIC JET FLOW; GREEN'S FUNCTIONS; PARALLEL FLOW; MATHEMATICAL MODELS; FREQUENCIES
Downloads: 151
[texts]Method for the determination of the noise from turbojet aircraft on take-off trajectories - Kobrynski, M
Method for determination of noise from turbojet aircraft on takeoff trajectories
Keywords: JET AIRCRAFT; NOISE MEASUREMENT; TAKEOFF; TRAJECTORIES; NOISE MEASUREMENT; TAKEOFF; TURBOJET AIRCRAFT
Downloads: 60
[texts]Analysis of the Hessian for Aerodynamic Optimization: Inviscid Flow - Arian, Eyal
In this paper we analyze inviscid aerodynamic shape optimization problems governed by the full potential and the Euler equations in two and three dimensions. The analysis indicates that minimization of pressure dependent cost functions results in Hessians whose eigenvalue distributions are identical for the full potential and the Euler equations. However the optimization problems in two and three dimensions are inherently different...
Keywords: SONIC BOOMS; JET AIRCRAFT NOISE; EXPOSURE; HUMAN REACTIONS; HUMAN TOLERANCES; HUMAN BEINGS; COMMUNITIES; PREDICTIONS
Downloads: 119
[texts]SOME RESULTS OF BIOMEDICAL INVESTIGATIONS CONDUCTED DURING THE GEMINI AND APOLLO PROGRAMS (ALTERATIONS IN BLOOD AND SKELETAL APPARATUS, MINERAL AND ELECTROLYTE METABOLISM IN THE ASTRONAUTS) - KOPANEV, V. I.
IT WAS FOUND THAT IN THE COURSE OF POSTFLIGHT EXAMINATIONS INDIVIDUAL ASTRONAUTS SHOWED CERTAIN CHANGES INVOLVING THE BLOOD (DECREASE IN ERYTHROCYTE MASS, LEUCOCYTOSIS AND SO FORTH), SKELETAL STRUCTURE (DECREASE IN BONE DENSITY), AND MINERAL AND ELECTROLYTE METABOLISM (WASHING OUT OF CALCIUM, IRON, POTASSIUM AND CHLORIDE).
Keywords: INFRARED SPECTRA; TURBULENT FLOW; HIGH TEMPERATURE GASES; JET AIRCRAFT NOISE; JET EXHAUST; JET FLOW
Downloads: 78
[texts]Ultrafast Narrow Band Modulation of VCSELs - Ning, Cun-Zhen
Multimode beating was greatly enhanced by taking output from part (e.g., half) of the output facet. Simpler sources of microwaves and millimeter waves of various frequencies were generated by varying the VCSEL diameter in a single multimode VCSEL our coupling of a few VCSELs. Breathing frequency in multi-mode operations affects modulation response and bandwidth. Optimizing RO frequency and mode beating frequency could potentially expand bandwidths suitable for wide band digital communications.
Keywords: DIRECT NUMERICAL SIMULATION; JET AIRCRAFT NOISE; SUPERSONIC JET FLOW; TURBULENT JETS; PARALLEL PROCESSING (COMPUTERS); FAR FIELDS
Downloads: 98
[texts]Techniques used in McDonnell-Douglas subjective noise-rating studies - Gabriel, R. F.
Flyover recordings of DC-8-55 with acoustically treated and existing nacelle configurations for use in psychoacoustic tests
Keywords: JET AIRCRAFT NOISE; NACELLES; NOISE REDUCTION; TURBOFAN ENGINES; ACOUSTIC DUCTS; AIRCRAFT DESIGN; CONFERENCES; ENGINE INLETS
Downloads: 74
[texts]Aeronautical Engineering: A special bibliography with indexes, supplement 51 - NON
This bibliography lists 206 reports, articles, and other documents introduced into the NASA Scientific and Technical Information System in November 1974.
Keywords: JET AIRCRAFT NOISE; JET IMPINGEMENT; TRAILING EDGE FLAPS; JET EXHAUST; SHORT TAKEOFF AIRCRAFT; SUBSONIC FLOW
Downloads: 239
[texts]Transfer of resonance radiation in a half space - Abramov, Yu. YU.
Wiener Hopf equations for transfer of resonance radiation in half spaces
Keywords: AIRCRAFT LANDING; NOISE REDUCTION; TAKEOFF RUNS; TU-124 AIRCRAFT; JET AIRCRAFT NOISE; TRAJECTORIES
Downloads: 63
[texts]Experimental investigation of distribution parameters in single-phase and double-phase subsonic plasma flows - Surov, N. S
Distribution parameters in single phase and double phase subsonic plasma flows
Keywords: AERODYNAMIC CHARACTERISTICS; JET AIRCRAFT; TURBOJET ENGINES; CONTROL STABILITY; ICE FORMATION; JET THRUST; LANDING; SWEPT WINGS; TAKEOFF
Downloads: 68
[texts]NASA directory of observation station locations, volume 1 - NON
Geodetic information is presented for NASA tracking stations and observation stations in the NASA geodetic satellites program. A geodetic data sheet is provided for each station, giving the position of the station and describing briefly how it was established. Geodetic positions and geocentric coordinates of these stations are tabulated on local or major geodetic datums, and on selected world geodetic systems when available information permits.
Keywords: JET AIRCRAFT NOISE; REFLECTION; SOUND PRESSURE; TURBOJET ENGINES; ACOUSTIC MEASUREMENT; SOUND FIELDS; TEST FACILITIES; WHITE NOISE
Downloads: 199
[texts]Light-detection electronics for a Raman lidar - Leser, R. J.
A light-detection system for an optical radar, or lidar, unit to be used for remote temperature and composition measurements was designed, built, and bench tested. This detection system processes three return signal wavelengths: two Raman wavelengths, and the Rayleigh-Mie wavelength at 694.3 nanometers. Means of coping with photomultiplier tube instabilities and limitations are discussed. Circuits for gain control, ranging, and digitizing are included...
Keywords: FLIGHT SAFETY; JET AIRCRAFT; PILOT PERFORMANCE; PSYCHOMOTOR PERFORMANCE; ACCIDENT PREVENTION; HUMAN FACTORS ENGINEERING; SAFETY FACTORS
Downloads: 83
[texts]Advanced Oxide Material Systems For 1650 C Thermal/Environmental Barrier Coating Applications - Zhu, Dongming
Advanced thermal/environmental barrier coatings (T/EBCs) are being developed for low emission SiC/SiC ceramic matrix composite (CMC) combustor and vane applications to extend the CMC liner and vane temperature capability to 1650 C (3000 F) in oxidizing and water-vapor containing combustion environments. The 1650 C T/EBC system is required to have better thermal stability, lower thermal conductivity, and improved sintering and thermal stress resistance than current coating systems...
Keywords: AEROACOUSTICS; THRUST; TURBINE EXHAUST NOZZLES; EXHAUST NOZZLES; AERODYNAMIC NOISE; JET AIRCRAFT NOISE; NOISE REDUCTION; SYSTEMS ENGINEERING
Downloads: 135
[texts]Thermal Theory of Combustion and Explosion - Semenov, N. N
This paper discusses the thermal theory of combustion and explosion, and conditions of ignition: transformation accompanied by heat liberation, transformation rate and temperature dependence.
Keywords: TURBOJET ENGINES; PROPULSION SYSTEM PERFORMANCE; AIRCRAFT PERFORMANCE; TECHNOLOGY ASSESSMENT; JET AIRCRAFT; RESEARCH AND DEVELOPMENT
Downloads: 188
[texts]Initial Isotopic Heterogeneities in ZAGAMI: Evidence of a Complex Magmatic History - Nyquist, L. E.
Interpretations of Zagami s magmatic history range from complex [1,2] to relatively simple [3]. Discordant radiometric ages led to a suggestion that the ages had been reset [4]. In an attempt to identify the mechanism, Rb-Sr isochrons were individually determined for both fine-grained and coarse-grained Zagami [5]. Ages of approx.180 Ma were obtained from both lithologies, but the initial Sr-87/Sr-86 (ISr) of the fine-grained lithology was higher by 8.6/-0.4 e-units...
Keywords: AEROACOUSTICS; JET AIRCRAFT NOISE; HIGH FREQUENCIES; SOUND PRESSURE; TRAILING EDGES; FLUIDICS; INJECTION; BYPASS RATIO
Downloads: 75
[texts]Boeing's High Voltage Solar Tile Test Results - Reed, Brian J.
Real concerns of spacecraft charging and experience with solar array augmented electrostatic discharge arcs on spacecraft have minimized the use of high voltages on large solar arrays despite numerous vehicle system mass and efficiency advantages. Boeing's solar tile (patent pending) allows high voltage to be generated at the array without the mass and efficiency losses of electronic conversion. Direct drive electric propulsion and higher power payloads (lower spacecraft weight) will benefit fro...
Keywords: AUTOMATIC LANDING CONTROL; AIRCRAFT PILOTS; HUMAN-COMPUTER INTERFACE; COMMERCIAL AIRCRAFT; JET AIRCRAFT; CIVIL AVIATION; FLIGHT ENVELOPES
Downloads: 83
[texts]CTAS Joint Software Development - Eshow, Michelle M
The Federal Aviation Administration (FAA) has decided to field major elements of the Center/TRACON (Terminal Radar Approach Control) Automation System (CTAS) to many air traffic control facilities across the United States. To facilitate the deployment, NASA, the FAA, and their contractors have conceived and implemented an innovative software development approach known as Joint Development. Under joint Development, NASA and the FAA are working in a common baseline of software that combines the pr...
Keywords: JET AIRCRAFT NOISE; NOISE PREDICTION; AEROACOUSTICS; PREDICTION ANALYSIS TECHNIQUES; COMPUTATIONAL FLUID DYNAMICS; TURBULENCE; STRESS TENSORS; REYNOLDS STRESS
Downloads: 17
[texts]Payload integration plan: Space Transportation System and SYNCOM 4 - NON
No Abstract Available
Keywords: AIRCRAFT ENGINES; CONVERGENT-DIVERGENT NOZZLES; NOZZLE DESIGN; SUPERSONIC NOZZLES; VARIABLE GEOMETRY STRUCTURES; JET AIRCRAFT; JET ENGINES; LENGTH; WEIGHT REDUCTION
Downloads: 86
[texts]Multiwavelength Blazar Studies - Kafatos, Mena
The present report concerns the following projects 'High energy emission from hot accretion disks from active galactic nuclei'; 'OSSE spectral timing and monitoring observations of Cygnus X- 1'; 'OSSE observations of blazars'; and 'Search for correlated time variations of bright EGRET blazars'. The most favored model for the central engine inAGNs is the supermassive black hole hypothesis (Rees 1978)...
Keywords: JET AIRCRAFT NOISE; LOW FREQUENCIES; COMFORT; ACTIVE CONTROL; AEROACOUSTICS; NOISE INTENSITY; NOISE REDUCTION; VIBRATION; ACTUATORS; POSITION (LOCATION); STRUCTURAL STABILITY
Downloads: 15
[texts]Analytic Guided-Search Model of Human Performance Accuracy in Target- Localization Search Tasks - Eckstein, Miguel P.
Current models of human visual search have extended the traditional serial/parallel search dichotomy. Two successful models for predicting human visual search are the Guided Search model and the Signal Detection Theory model. Although these models are inherently different, it has been difficult to compare them because the Guided Search model is designed to predict response time, while Signal Detection Theory models are designed to predict performance accuracy...
Keywords: ACOUSTICS; JET AIRCRAFT NOISE; FAR FIELDS; NOISE PREDICTION (AIRCRAFT); AEROACOUSTICS; NOISE GENERATORS; SOUND GENERATORS; SOUND PROPAGATION; NOISE PROPAGATION
Downloads: 43
[texts]Effects of Rotor Wake on Film Cooling Investigated - NON
Through a combination of experimental and computational studies, researchers at the NASA Lewis Research Center investigated the effect of upstream blade-row wake passing on the showerhead (leading edge) film cooling of a downstream turbine. The experiments were performed in a steady-flow annular turbine cascade facility equipped with an upstream rotating row of cylindrical rods to produce a periodic wake field similar to that found in an actual turbine...
Keywords: INTEGRATED CIRCUITS; ANTENNA ARRAYS; MICROWAVE CIRCUITS; PHASED ARRAYS; ACTS; COSTS; GALLIUM ARSENIDES; SATELLITE COMMUNICATION; LEAR JET AIRCRAFT; SUPERHIGH FREQUENCIES
Downloads: 69
[texts]Multimodality pilot model for visual and motion cues - Stapleford, R. L
Multimodality model of pilot control behavior using visual and motion cues
Keywords: ACOUSTIC DUCTS; SOUND TRANSMISSION; BOEING 707 AIRCRAFT; NACELLES; TURBOFAN ENGINES; CONFERENCES; GLASS FIBERS; JET AIRCRAFT NOISE; LAMINATES; NOISE REDUCTION
Downloads: 48
[texts]An Approximation Method for the Integration of the Equations of a Nonstationary Laminar Boundary Layer in an Incompressible Fluid - Rozin, L. A
An approximate solution is presented of the equations of a nonstationary laminar boundary layer in an incompressible fluid, based on the use of the momentum equations and a certain one-parameter family of velocity profiles. As is well known, this method of approximating the solution yields good results in the study of stationary problems. In the study of nonstationary problems, this approach leads to simpler approximate solutions than those derived from the usual method of successive approximati...
Keywords: AERODYNAMIC CHARACTERISTICS; MANEUVERABILITY; JET AIRCRAFT; OPERATIONAL PROBLEMS; TRANSONIC SPEED; TRANSPORT AIRCRAFT; MULTIENGINE VEHICLES; LATERAL CONTROL; LONGITUDINAL STABILITY; BUFFETING
Downloads: 46
[texts]MANEUVER ACCELERATIONS EXPERIENCED DURING ROUTINE OPERATIONS OF A COMMERCIAL TURBOJET TRANSPORT AIRPLANE - Fetner, M. W.
Maneuver acceleration of commercial turbojet transport airplane
Keywords: ACCELERATION; TRANSPORT AIRCRAFT; TURBOJET AIRCRAFT; COMMERCIAL AIRCRAFT; JET AIRCRAFT; MANEUVERS; TRANSPORT AIRCRAFT; TURBOJET ENGINES; ACCELERATION; COMMERCIAL AIRCRAFT; MANEUVER
Downloads: 148
[texts]Helicopter simulation: Making it work - Payne, Barr
The opportunities for improved training and checking by using helicopter simulators are greater than they are for airplane pilot training. Simulators permit the safe creation of training environments that are conducive to the development of pilot decision-making, situational awareness, and cockpit management. This paper defines specific attributes required in a simulator to meet a typical helicopter operator's training and checking objectives.
Keywords: AIR FLOW; JET AIRCRAFT NOISE; MIXING LAYERS (FLUIDS); NOISE REDUCTION; S WAVES; SOUND WAVES; FLOW STABILITY; SHEAR FLOW
Downloads: 78
[texts]Wind-Tunnel Tests at Low Speed of Swept and Yawed Wings Having Various Plan Forms - Purser, Paul E.
Wind tunnel tests haved been made at low speed to various small-scale models of swept-back, swept-forward, and yawed wings. Tests covered changes in aspect ratio, taper ratio, and tip shape.
Keywords: UNSTRUCTURED GRIDS (MATHEMATICS); JET AIRCRAFT NOISE; NAVIER-STOKES EQUATION; SOUND WAVES; SCREECH TONES; NEAR FIELDS; MACH NUMBER
Downloads: 90
[texts]Mutation induction in bacteria after heavy ion irradiation - Horneck, G.
From a compilation of experimental data on the mutagenic effects of heavy ions in bacteria, main conclusions have been drawn as follows: (1) The mutagenic efficacy of heavy ions in bacteria depends on physical and biological variables. Physical variables are the radiation dose, energy and charge of the ion; the biological variables are the bacterial strain, the repair genotype of bacteria, and the endpoint investigated (type of mutation, induction of enzymes related to mutagenesis); (2) The resp...
Keywords: AEROACOUSTICS; JET AIRCRAFT NOISE; POINT SOURCES; POWER SPECTRA; JET FLOW; NOISE PREDICTION; REFRACTION; SHIELDING; WAVE EQUATIONS; CONVECTION; EMITTANCE; GREEN'S FUNCTIONS
Downloads: 70
[texts]SMDS User Application Trials - McCabe, James D
This paper discusses the trial of scientific user applications over the Switched Multimegabit Data Service (SMDS). An interLATA (Local Access Transport Area) testbed was built between NAS and Rockwell International, using AT&T, GTE, and PacBell SMDS. The interactive and throughput characteristics of SMDS were tested using interactive and file transfer applications, and scientific user applications that visualized Computational Fluid Dynamics (CFD) solution data...
Keywords: AEROACOUSTICS; STREAMS; LOW FREQUENCIES; ACOUSTIC PROPERTIES; AERODYNAMIC NOISE; JET AIRCRAFT NOISE; JET MIXING FLOW; NOISE MEASUREMENT; MIXERS; NOISE SPECTRA; SIGNATURES
Downloads: 92
[texts]Studies of atmospheric attenuation of noise - Little, J. W.
Atmospheric attenuation of jet aircraft noise
Keywords: ACOUSTIC MEASUREMENT; JET AIRCRAFT NOISE; NASA PROGRAMS; NOISE REDUCTION; CONFERENCES; NACELLES; NOISE PROPAGATION; SONIC BOOMS; SOUND TRANSMISSION
Downloads: 64
[texts]Density in a Planetary Exosphere - Herring, Jackson
A discussion of the Opik-Singer theory of the density of a planetary exosphere is presented. Their density formula permits the calculation of the depth of the exosphere. Since the correctness of their derivation of the basic formula for the density distribution has been questioned, an alternate method based directly on Liouville's theorem is given. It is concluded that the Opik-Singer formula seems valid for the ballistic component of the exosphere; but for a complete description of the planetar...
Keywords: JET AIRCRAFT NOISE; DATA ACQUISITION; NOISE MEASUREMENT; REFLECTION; NUMERICAL ANALYSIS; EXPERIMENTATION; PROCEDURES; FAR FIELDS; ACOUSTIC SCATTERING; DECAY; CORRECTION
Downloads: 83
[texts]Pulsating Hydrodynamic Instability in a Dynamic Model of Liquid-Propellant Combustion - Margolis, Stephen B
Hydrodynamic (Landau) instability in combustion is typically associated with the onset of wrinkling of a flame surface, corresponding to the formation of steady cellular structures as the stability threshold is crossed. In the context of liquid-propellant combustion, such instability has recently been shown to occur for critical values of the pressure sensitivity of the burning rate and the disturbance wavenumber, significantly generalizing previous classical results for this problem that assume...
Keywords: FIGHTER AIRCRAFT; JET AIRCRAFT NOISE; NOISE REDUCTION; SUPERSONIC AIRCRAFT; RESEARCH; NASA PROGRAMS; LININGS; COMPUTATIONAL FLUID DYNAMICS; SPACECRAFT PROPULSION
Downloads: 92
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